I had that occur when I unpacked an aluminum cone while making a video. Got to remember that they are under tension. That tension issue was a concern for me when I designed this new windscreen. I releived the tension by heat treating. You can see from my last video that there is no longer a concern of a "jumping out" issue. I consider that a major improvement over the DIY or commercial cones.
Watch the video:
By the way, the stainless steel band closure strip that helps hold my windscreen together is in part an idea that Jason Klass came up with a few years ago. I think he called it a belt buckle closure. It had quite a few holes punched in it to reduce weight. Thanks Jason :-)